[1] Zhong Q, Inniss D, Kjoller K and Elings V B 1993
Surf. Sci. 290 L688

[2] Garc\'{\ia R and Perez R 2002 Surf. Sci. Rep.
47 197

[3] Yu A F, Qi Q, Jiang P and Jiang C 2009 Chin. Phys.
Lett. 26 078501

[4] Anselmetti D, Luthi R, Meyer E, Richmond T, Dreier M,
Frommer J E and Guntherodt H J 2004 Nanotechnology 5 87

[5] Bustamante C and Keller D 1995 Phys. Today 48
33

[6] Han G Q, Zeng Y G, Yu J Z and Cheng B W 2008 Chin.
Phys. Lett. 25 242

[7] Ohnesorge F 1999 Surf. Interface Anal. 27 379

[8] Tello M, San Paulo A, Rodriguez T R, Blanco M C and
Garc\'{\ia R 2003 Ultramicroscopy 97 171

[9] Noy A, Sanders C H, Vezenov D V, Wong S S and Lieber C M
1998 Langmuir 14 1508

[10] Tamayo J and Garc\'{\ia R 1998 Appl. Phys. Lett.
73 2926

[11] Rodriguez T R and Garc\'{\ia R 2003 Appl. Phys.
Lett. 84 449

[12] Martinez N F, Patil S, Lozano J R and Garc\'{\ia R 2006
Appl. Phys. Lett. 89 153115

[13] Stark R W and Heckl W M 2000 Surf. Sci. 457
219

[14] Sahin O and Erina N 2008 Nanotechnology 19
445717

[15] Legleiter J, Park M, Cusik B and Kowalewski T 2006
Proc. Natl. Acad. Sci. U.S.A. 103 4813

[16] Rabe U, Janser K and Arnold W 1996 Rev. Sci.
Instrum. 67 3281

[17] Israelachvili J 1985 Intermolecular and Surface
Forces (New York: Academic)

[18] Cappella B and Dietler G 1999 Surf. Sci. Rep.
34 1

[19] Derjauin B V, M\"{uller V M and Toporov Y P 1975 J.
Colloid Interface Sci. 53 314

[20] Garc\'{\ia R, Gomez C J, Martinez N F, Patil S, Dietz C
and Magerle R 2006 Phys. Rev. Lett. 97 016103

[21] Bausch A R, Ziemann F, Boulbitch A A, Jacobson K and
Sackmann E 1998 Biophys. J. 75 2038

[22] www.gnu.org/software/gsl

[23] Hillenbrand R, Stark M and Guckenberger R 2000 Appl.
Phys. Lett. 76 3478

[24] Garc\'{\ia R and San Paulo A 2000 Phys. Rev. B
61 13381

[25] Tamayo J and Garc\'{\ia R 1996 Langmuir 12
4430